Skit is a tool for managing database development. Its purpose is to allow the database definition to be managed using a Source Code management system, and to provide the means to upgrade and patch databases in a similar way to that done for source code.
The skitproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/skit, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.